release/src-rt-6.x/linux/linux-2.6/include/asm-powerpc/abs_addr.h

   1 #ifndef _ASM_POWERPC_ABS_ADDR_H
   2 #define _ASM_POWERPC_ABS_ADDR_H
   3 #ifdef __KERNEL__
   4
   5
   6 /*
   7  * c 2001 PPC 64 Team, IBM Corp
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <asm/types.h>
  16 #include <asm/page.h>
  17 #include <asm/prom.h>
  18 #include <asm/lmb.h>
  19 #include <asm/firmware.h>
  20
  21 struct mschunks_map {
  22         unsigned long num_chunks;
  23         unsigned long chunk_size;
  24         unsigned long chunk_shift;
  25         unsigned long chunk_mask;
  26         u32 *mapping;
  27 };
  28
  29 extern struct mschunks_map mschunks_map;
  30
  31 /* Chunks are 256 KB */
  32 #define MSCHUNKS_CHUNK_SHIFT    (18)
  33 #define MSCHUNKS_CHUNK_SIZE     (1UL << MSCHUNKS_CHUNK_SHIFT)
  34 #define MSCHUNKS_OFFSET_MASK    (MSCHUNKS_CHUNK_SIZE - 1)
  35
  36 static inline unsigned long chunk_to_addr(unsigned long chunk)
  37 {
  38         return chunk << MSCHUNKS_CHUNK_SHIFT;
  39 }
  40
  41 static inline unsigned long addr_to_chunk(unsigned long addr)
  42 {
  43         return addr >> MSCHUNKS_CHUNK_SHIFT;
  44 }
  45
  46 static inline unsigned long phys_to_abs(unsigned long pa)
  47 {
  48         unsigned long chunk;
  49
  50         /* This is a no-op on non-iSeries */
  51         if (!firmware_has_feature(FW_FEATURE_ISERIES))
  52                 return pa;
  53
  54         chunk = addr_to_chunk(pa);
  55
  56         if (chunk < mschunks_map.num_chunks)
  57                 chunk = mschunks_map.mapping[chunk];
  58
  59         return chunk_to_addr(chunk) + (pa & MSCHUNKS_OFFSET_MASK);
  60 }
  61
  62 /* Convenience macros */
  63 #define virt_to_abs(va) phys_to_abs(__pa(va))
  64 #define abs_to_virt(aa) __va(aa)
  65
  66 /*
  67  * Converts Virtual Address to Real Address for
  68  * Legacy iSeries Hypervisor calls
  69  */
  70 #define iseries_hv_addr(virtaddr)       \
  71         (0x8000000000000000 | virt_to_abs(virtaddr))
  72
  73 #endif /* __KERNEL__ */
  74 #endif /* _ASM_POWERPC_ABS_ADDR_H */